Scrotal Mass
A lump or swelling in the scrotum with several possible causes
Quick Facts
- Type: Genital sign
- Common causes: Cysts, fluid collections, varicocele, infection
- Important: Most are benign, but some need urgent care
- Emergency: Sudden severe pain and swelling
Overview
A scrotal mass is any lump or swelling felt within the scrotum, the pouch of skin that holds the testicles. It may arise from the testicle itself or from the surrounding structures such as the epididymis, blood vessels, or the sac around the testicle. Scrotal masses are common, and the great majority are benign.
Causes range from harmless fluid collections and cysts to varicose veins, infections, and — less commonly — testicular cancer. Because some causes need prompt treatment, any new lump, swelling, or change in a testicle should be checked by a clinician. Knowing what is normal for your own body through regular self-checks helps you notice changes early.
It is normal for the two testicles to differ slightly in size and for one to hang a little lower than the other, and the cord-like structures above and behind each testicle can be felt as part of normal anatomy. What matters is noticing a new lump, a change in size or firmness, or new swelling. A soft, fluid-filled swelling behaves differently from a firm lump on the testicle itself, and these distinctions help guide whether the cause is likely harmless or needs closer attention.
Common Causes
A scrotal mass can have several causes:
- Hydrocele: A painless collection of fluid around the testicle.
- Epididymal cyst (spermatocele): A harmless fluid-filled lump near the top of the testicle.
- Varicocele: Enlarged veins in the scrotum, often described as feeling like a "bag of worms."
- Infection: Epididymitis or orchitis cause swelling, pain, and tenderness.
- Inguinal hernia: A loop of bowel pushing into the scrotum.
- Testicular cancer: A firm, usually painless lump on the testicle — uncommon but important to detect early.
Associated Symptoms
The features around a scrotal mass help suggest the cause:
- Painless lump or swelling, which can occur with cysts, hydroceles, and some cancers
- Pain, warmth, redness, or fever, suggesting infection
- A dragging or heavy sensation, common with varicoceles or large hydroceles
- A lump that comes and goes or enlarges with straining, suggesting a hernia
- Sudden, severe pain with swelling, which can be an emergency
Sudden severe testicular pain may indicate testicular torsion, a twisting that cuts off blood supply and requires immediate surgery.
Diagnosis & Evaluation
A clinician evaluates a scrotal mass through examination and, usually, an ultrasound.
- Physical exam: Feeling the mass to assess its location, size, tenderness, and whether it transilluminates (lets light through, as fluid does).
- Scrotal ultrasound: The main test to determine whether a mass is solid or fluid-filled and where it arises.
- Blood and urine tests: To check for infection or, in some cases, tumor markers.
- Further evaluation: Additional imaging if cancer or a hernia is suspected.
Treatment & Management
Treatment depends entirely on the cause.
- Hydroceles and small cysts: Often need no treatment unless large or bothersome, in which case they can be drained or removed.
- Varicoceles: Treated if causing pain, swelling, or fertility concerns, sometimes with a minor procedure.
- Infections: Antibiotics for bacterial epididymitis or orchitis, with pain relief and support.
- Hernias: Usually repaired surgically.
- Testicular cancer: Treated with surgery and, depending on the type and stage, additional therapy; it is highly treatable, especially when found early.
Self-Care & Prevention
- Perform regular testicular self-exams to learn what is normal for you
- Report any new lump, swelling, or change promptly
- Use condoms to reduce the risk of infections that can cause swelling
- Support the scrotum and use pain relief for mild discomfort while awaiting evaluation
- Do not assume a painless lump is harmless — have it checked
When to See a Doctor
See a doctor for any new scrotal lump or swelling, even if it is painless. Seek emergency care immediately for:
- Sudden, severe testicular pain, with or without swelling
- Pain with nausea, vomiting, or a testicle that sits higher or at an odd angle
- Rapid swelling with fever, suggesting serious infection
- A lump that suddenly becomes very painful
Sudden severe testicular pain may be testicular torsion, which is an emergency — the testicle can be saved only if treated quickly, so do not wait.
Frequently Asked Questions
Is a lump in the scrotum always cancer?
No. Most scrotal masses are benign, such as fluid collections (hydroceles), cysts, or enlarged veins (varicoceles). However, because testicular cancer is possible, any new lump should be evaluated, as early detection makes it highly treatable.
What does a harmless scrotal lump feel like?
Benign lumps such as cysts and hydroceles are often soft, smooth, and painless, and fluid collections may let light pass through them. Cancerous lumps tend to be firm and on the testicle itself, but appearance alone is not reliable, so any lump needs a clinician's assessment.
Can a scrotal mass be painful?
Yes. Infections such as epididymitis cause painful swelling, and a hernia or large hydrocele can feel heavy or achy. Sudden severe pain, however, can indicate testicular torsion, which is a surgical emergency.
How is a scrotal mass diagnosed?
A clinician examines the scrotum and usually orders an ultrasound, which shows whether the mass is solid or fluid-filled and where it comes from. Blood and urine tests may be added to check for infection or tumor markers.
When is a scrotal mass an emergency?
Seek emergency care for sudden, severe testicular pain, especially with nausea, vomiting, or a testicle that sits high or at an angle, as this may be testicular torsion. Rapid swelling with high fever also needs urgent care.
References
- MedlinePlus, U.S. National Library of Medicine. Scrotal masses.
- Mayo Clinic. Testicular lump — Causes.
- American Cancer Society. Testicular cancer detection and signs.
- National Health Service (NHS). Testicular lumps and swellings.